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The design of single loop transistor feedback amplifiers is considered. A criterion of stability is introduced which is useful for either calculating or measuring the stability margins of transistor amplifiers, and in particular, single loop feedback amplifiers. Expressions are derived for relating sensitivity and impedance to feedback. Practical design techniques are discussed and are illustrated by the design of a one-megacycle carrier-frequency feedback amplifier. It is shown that a transistor feedback amplifier is an excellent wideband video amplifier.